The answer is; raccoons and rodents
Racoon will burrow in the soil or tree logs and form a den where they can litter. When threatened, the raccoon can retreat to its hideout or climb a tree. Rodents also scrawl the bottom of the forest finding food. They also love to burrow or hide in crevices of fallen tree trumps or rocks.
Because of a tide probably or rain
Oils and fats are types of lipids.
Loess is a geologically material which is usually yellowish or brown in color and consisting of tiny mineral particles brought by wind to the places where they now lie. It is a sedimentary deposit of mineral particles which are finer than sand but coarser than dust or clay, deposited by the wind. Loess is a type of silt which forms fertile topsoil in some parts of the world. The soil has few clay particles to hold it together. It is composed mainly of quartz crystals which slide easily against each other, and is therefore very subject to erosion.
I believe you meant 'selective breeding'.
Selecitve Breeding is when say a dog breeder, chooses two prospective parents in hopes of achieveing a superior offspring or offspring with desired traits.